Add an example for sfield
Add an example for sfield

Davidjohnwilson/sympy,oliverlee/sympy,abhiii5459/sympy,farhaanbukhsh/sympy,aktech/sympy,jaimahajan1997/sympy,aktech/sympy,VaibhavAgarwalVA/sympy,MechCoder/sympy,oliverlee/sympy,jerli/sympy,ga7g08/sympy,maniteja123/sympy,jerli/sympy,emon10005/sympy,AkademieOlympia/sympy,drufat/sympy,sahmed95/sympy,madan96/sympy,kaichogami/sympy,chaffra/sympy,lindsayad/sympy,kaichogami/sympy,sampadsaha5/sympy,postvakje/sympy,wanglongqi/sympy,souravsingh/sympy,skidzo/sympy,hargup/sympy,Vishluck/sympy,skidzo/sympy,chaffra/sympy,ga7g08/sympy,Titan-C/sympy,jbbskinny/sympy,ChristinaZografou/sympy,mcdaniel67/sympy,Shaswat27/sympy,iamutkarshtiwari/sympy,jaimahajan1997/sympy,AkademieOlympia/sympy,lindsayad/sympy,souravsingh/sympy,ChristinaZografou/sympy,hargup/sympy,jbbskinny/sympy,wanglongqi/sympy,postvakje/sympy,yashsharan/sympy,rahuldan/sympy,Curious72/sympy,VaibhavAgarwalVA/sympy,MechCoder/sympy,maniteja123/sympy,lindsayad/sympy,kaushik94/sympy,madan96/sympy,saurabhjn76/sympy,kaichogami/sympy,saurabhjn76/sympy,chaffra/sympy,AkademieOlympia/sympy,mcdaniel67/sympy,sahmed95/sympy,iamutkarshtiwari/sympy,jerli/sympy,Shaswat27/sympy,kevalds51/sympy,kaushik94/sympy,VaibhavAgarwalVA/sympy,Titan-C/sympy,drufat/sympy,yashsharan/sympy,sampadsaha5/sympy,Curious72/sympy,emon10005/sympy,Vishluck/sympy,souravsingh/sympy,yukoba/sympy,Davidjohnwilson/sympy,mafiya69/sympy,sampadsaha5/sympy,drufat/sympy,ahhda/sympy,jaimahajan1997/sympy,kevalds51/sympy,Shaswat27/sympy,skidzo/sympy,abhiii5459/sympy,abhiii5459/sympy,mafiya69/sympy,yukoba/sympy,wanglongqi/sympy,Arafatk/sympy,rahuldan/sympy,farhaanbukhsh/sympy,ahhda/sympy,Titan-C/sympy,rahuldan/sympy,MechCoder/sympy,sahmed95/sympy,Vishluck/sympy,oliverlee/sympy,mafiya69/sympy,mcdaniel67/sympy,emon10005/sympy,yashsharan/sympy,iamutkarshtiwari/sympy,farhaanbukhsh/sympy,maniteja123/sympy,Arafatk/sympy,kaushik94/sympy,Arafatk/sympy,postvakje/sympy,madan96/sympy,ahhda/sympy,hargup/sympy,aktech/sympy,Davidjohnwilson/sympy,ChristinaZografou/sympy,saurabhjn76/sympy,kevalds51/sympy,jbbskinny/sympy,yukoba/sympy,Curious72/sympy,ga7g08/sympy